Triphenyl phosphite as an electrolyte additive to improve the cyclic stability of lithium-rich layered oxide cathode for lithium-ion batteries

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• 作者：Zhenxin Zhou ; Yulin Ma ; ^{mayulin@hit.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{myl510@163.com" class="auth_mail" title="E-mail the corresponding author} ; Long Wang ; Pengjian Zuo ; Xinqun Cheng ; Chunyu Du ; Geping Yin ; Yunzhi Gao
• 关键词：Lithium-ion battery ; Electrolyte additive ; Triphenyl phosphite ; Lithium-rich layered oxide cathode materials ; High voltage
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：20 October 2016
• 年：2016
• 卷：216
• 期：Complete
• 页码：44-50
• 全文大小：2344 K

文摘

Triphenyl phosphite (TPPi) was investigated as an electrolyte additive for high-voltage lithium-ion batteries using lithium-rich layered oxide cathode in this paper. The cyclic stability of Li_1.16Ni_0.2Co_0.1Mn_0.54O₂ was improved significantly with the adoption of 0.2 wt. % TPPi. The capacity retention of Li_1.16Ni_0.2Co_0.1Mn_0.54O₂ was improved significantly, especially at elevated temperature, from 69.0% to 89.6% after 90 cycles. Electrochemical and physical characterizations indicated that TPPi was oxidized at 4.2 V (vs. Li/Li⁺), which was lower than that of the solvents and lithium extraction from Li_1.16Ni_0.2Co_0.1Mn_0.54O₂, and the oxidization resulting in an artificial cathode interface film, which effectively inhibited the decomposition of traditional electrolyte and protected Li_1.16Ni_0.2Co_0.1Mn_0.54O₂ material from destruction.